Human brain has a surprising plasticity. Experiments showed that people can live normally after a few days, when asked to wear permanently some VR-like goggles which flip the image of their environment.
Thus, I think a few dozen minutes should be enough for any motivated - and not color-blind - human to totally adjust on this court.
More interesting, maybe science is currently learning us the answer of the other thread about why french players/coaches fare that well (relatively speaking): in our country tennis is not a sport reserved to rich kids and whining princesses